/*
	Burhan Ahmad, walk-through portfolio.
	The world is a fixed WebGL canvas. The page scrolls normally over it, and
	each project section is one stop on the walk. The text stays quiet and
	black and white so the scenes and the footage carry the colour.
*/

:root {
	--bg: #08080a;
	--fg: #f3f1ec;
	--muted: #a19f99;
	--line: rgba(243, 241, 236, 0.16);
	--accent: #f3f1ec;
	--font: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
	--gutter: clamp(1rem, 4vw, 3.5rem);
	color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

body {
	margin: 0;
	background: var(--bg);
	color: var(--fg);
	font-family: var(--font);
	font-size: 1.0625rem;
	line-height: 1.55;
	-webkit-font-smoothing: antialiased;
	overflow-x: hidden;
}

a { color: inherit; }
img, video { display: block; max-width: 100%; }
h1, h2, h3, p { margin: 0; }
h1, h2 { text-wrap: balance; }
:focus-visible { outline: 2px solid var(--fg); outline-offset: 3px; }

/* Nav */
.nav {
	position: fixed;
	z-index: 30;
	top: 0;
	left: 0;
	right: 0;
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	padding: 1.1rem var(--gutter);
	padding-top: calc(1.1rem + env(safe-area-inset-top, 0px));
	font-size: 0.9rem;
}
.nav-name { font-weight: 700; font-stretch: 125%; text-decoration: none; letter-spacing: -0.01em; }
.nav nav { display: flex; gap: clamp(0.9rem, 2.4vw, 2rem); }
.nav nav a { text-decoration: none; color: var(--muted); transition: color 0.2s; }
.nav nav a:hover { color: var(--fg); }

/* World */
.world {
	position: fixed;
	inset: 0;
	z-index: 0;
}
#scene, #scene canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
#scene canvas { cursor: default; touch-action: pan-y; }
#scene canvas.is-pointing { cursor: pointer; }
.vignette {
	position: absolute;
	inset: 0;
	pointer-events: none;
	background:
		linear-gradient(90deg, rgba(8, 8, 10, 0.78) 0%, rgba(8, 8, 10, 0.35) 30%, rgba(8, 8, 10, 0) 48%),
		linear-gradient(0deg, rgba(8, 8, 10, 0.5) 0%, rgba(8, 8, 10, 0) 22%);
}

/* Progress */
.hud {
	position: fixed;
	z-index: 20;
	left: var(--gutter);
	right: var(--gutter);
	bottom: calc(1.2rem + env(safe-area-inset-bottom, 0px));
	display: flex;
	align-items: center;
	gap: 1rem;
	pointer-events: none;
	font-size: 0.78rem;
	color: var(--muted);
	letter-spacing: 0.04em;
	-webkit-user-select: none;
	user-select: none;
}
.hud-play {
	pointer-events: auto;
	flex: none;
	display: grid;
	place-items: center;
	width: 2.4rem;
	height: 2.4rem;
	padding: 0;
	border: 1px solid var(--line);
	border-radius: 50%;
	background: rgba(8, 8, 10, 0.55);
	-webkit-backdrop-filter: blur(8px);
	backdrop-filter: blur(8px);
	color: var(--fg);
	cursor: pointer;
	transition: border-color 0.2s, background 0.2s, transform 0.2s;
}
.hud-play:hover { border-color: rgba(243, 241, 236, 0.6); background: rgba(8, 8, 10, 0.75); }
.hud-play:active { transform: scale(0.94); }
.hud-play:focus-visible, .track:focus-visible { outline: 2px solid var(--fg); outline-offset: 4px; }
.hud-play svg { grid-area: 1 / 1; width: 0.85rem; height: 0.85rem; fill: currentColor; }
.hud-play .i-pause, .is-playing .hud-play .i-play { display: none; }
.is-playing .hud-play .i-pause { display: block; }

/* The timeline is a scrubber: click or drag anywhere on it */
.track {
	flex: 1;
	height: 2px;
	border-radius: 2px;
	background: var(--line);
	position: relative;
	pointer-events: auto;
	cursor: pointer;
	touch-action: none;
	transition: height 0.15s;
}
.track::before { content: ''; position: absolute; left: -0.6rem; right: -0.6rem; top: -1.1rem; bottom: -1.1rem; }
.track:hover, .is-scrubbing .track { height: 4px; }
.track:focus { outline: none; }
.track-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0; border-radius: inherit; background: var(--fg); }
.track-fill::after {
	content: '';
	position: absolute;
	right: -7px;
	top: 50%;
	width: 14px;
	height: 14px;
	margin-top: -7px;
	border-radius: 50%;
	background: var(--fg);
	box-shadow: 0 0 0 4px rgba(8, 8, 10, 0.35);
	transform: scale(0);
	transition: transform 0.15s;
}
.track:hover .track-fill::after, .track:focus-visible .track-fill::after, .is-scrubbing .track-fill::after { transform: scale(1); }
@media (hover: none) { .track-fill::after { transform: scale(0.7); } }
.track-tip {
	position: absolute;
	bottom: 1.9rem;
	left: 0;
	transform: translate(-50%, 4px);
	display: flex;
	gap: 0.5em;
	align-items: baseline;
	padding: 0.4rem 0.65rem;
	border: 1px solid var(--line);
	border-radius: 6px;
	background: rgba(8, 8, 10, 0.88);
	color: var(--fg);
	font-size: 0.78rem;
	white-space: nowrap;
	pointer-events: none;
	opacity: 0;
	transition: opacity 0.15s, transform 0.15s;
}
.track-tip b { font-weight: 500; color: var(--muted); font-variant-numeric: tabular-nums; }
.track-tip.is-on { opacity: 1; transform: translate(-50%, 0); }
.hud-chapter { min-width: 9rem; text-align: right; }

.cue-play {
	padding: 0;
	border: 0;
	background: none;
	font: inherit;
	color: var(--fg);
	text-decoration: underline;
	text-decoration-color: var(--muted);
	text-underline-offset: 0.25em;
	cursor: pointer;
}
.cue-play:hover { text-decoration-color: var(--fg); }

/* Stops */
.stops { position: relative; z-index: 10; }
.stop { position: relative; }
.panel { max-width: 25rem; }

.kicker {
	font-size: 0.8rem;
	letter-spacing: 0.06em;
	color: var(--muted);
	margin-bottom: 0.9rem;
}
h1 {
	font-size: clamp(3rem, 8.5vw, 7.5rem);
	font-weight: 800;
	font-stretch: 125%;
	line-height: 0.88;
	letter-spacing: -0.035em;
	margin-bottom: 1.4rem;
}
h2 {
	font-size: clamp(2rem, 4vw, 3.2rem);
	font-weight: 750;
	font-stretch: 112%;
	line-height: 0.98;
	letter-spacing: -0.025em;
	margin-bottom: 0.7rem;
}
.lede { font-size: 1.12rem; color: #d6d4ce; max-width: 24rem; }
.lede-sm { font-size: 1.05rem; color: #e2e0da; margin-bottom: 0.8rem; }
.meta { color: var(--muted); font-size: 0.92rem; margin-bottom: 1rem; }
.panel p + p { margin-top: 0.6rem; }
.tools { color: var(--muted); font-size: 0.86rem; }
.watch, .again {
	margin-top: 1.4rem;
	display: inline-flex;
	align-items: center;
	gap: 0.6rem;
	font: inherit;
	font-size: 0.9rem;
	font-weight: 600;
	color: var(--bg);
	background: var(--fg);
	border: 0;
	border-radius: 999px;
	padding: 0.7rem 1.15rem;
	cursor: pointer;
	text-decoration: none;
	transition: transform 0.2s;
}
.watch::before {
	content: '';
	width: 0;
	height: 0;
	border-left: 0.5rem solid currentColor;
	border-top: 0.32rem solid transparent;
	border-bottom: 0.32rem solid transparent;
}
.watch:hover, .again:hover { transform: translateY(-1px); }

.scroll-cue {
	margin-top: 2.4rem;
	display: flex;
	align-items: center;
	gap: 0.8rem;
	font-size: 0.85rem;
	color: var(--muted);
}
.cue-line { width: 3rem; height: 1px; background: var(--muted); position: relative; overflow: hidden; }
.cue-line::after {
	content: '';
	position: absolute;
	inset: 0;
	background: var(--fg);
	transform: translateX(-100%);
	animation: cue 2.2s ease-in-out infinite;
}
@keyframes cue { 60%, 100% { transform: translateX(100%); } }

.roles { list-style: none; padding: 0; margin: 1.2rem 0; border-top: 1px solid var(--line); }
.roles li {
	display: grid;
	grid-template-columns: 6.5rem 1fr;
	gap: 0 1rem;
	padding: 0.6rem 0;
	border-bottom: 1px solid var(--line);
	font-size: 0.92rem;
}
.roles li span:first-child { color: var(--muted); grid-row: span 2; }
.roles li span:last-child { color: var(--muted); }

.mail {
	display: inline-block;
	margin-top: 1.2rem;
	font-size: clamp(1.3rem, 2.4vw, 1.8rem);
	font-weight: 700;
	font-stretch: 110%;
	text-decoration-thickness: 1px;
	text-underline-offset: 0.25em;
}
.links { list-style: none; padding: 0; margin: 1rem 0 0; display: flex; gap: 1.4rem; }
.links a { color: var(--muted); text-decoration: none; }
.links a:hover { color: var(--fg); }
.again { background: transparent; color: var(--fg); border: 1px solid var(--line); }

/* 3D layout: each stop is a stretch of the walk. Its panel pins while
   Burhan crosses that stretch, and JS fades it with --vis. */
.is-3d .stop { height: 190vh; }
.is-3d .stop-intro { height: 150vh; }
.is-3d .stop-about { height: 210vh; }
.is-3d .stop-contact { height: 160vh; }
.is-3d .panel {
	position: sticky;
	top: 0;
	min-height: 100vh;
	display: flex;
	flex-direction: column;
	justify-content: center;
	padding: 5rem var(--gutter) 4rem;
	max-width: calc(25rem + 2 * var(--gutter));
	opacity: var(--vis, 0);
	transform: translateY(calc((1 - var(--vis, 0)) * 1.2rem));
	will-change: opacity, transform;
}
.is-3d .panel > * { align-self: flex-start; }
/* a soft shadow keeps the copy readable over bright scenes */
.is-3d .panel h1, .is-3d .panel h2, .is-3d .panel p, .is-3d .panel li { text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45), 0 2px 22px rgba(0, 0, 0, 0.6); }
.is-3d .panel-wide { max-width: calc(30rem + 2 * var(--gutter)); }
.is-3d .stop-intro .panel { max-width: calc(34rem + 2 * var(--gutter)); }
.is-3d .panel.is-off { visibility: hidden; }

@media (max-width: 999px) {
	.is-3d .panel {
		justify-content: flex-end;
		padding: 5rem 1rem 3.6rem;
		max-width: none;
	}
	.is-3d .panel > * { position: relative; }
	.is-3d .panel::before {
		content: '';
		position: absolute;
		left: 0;
		right: 0;
		bottom: 0;
		height: 58%;
		background: linear-gradient(0deg, rgba(8, 8, 10, 0.94) 35%, rgba(8, 8, 10, 0));
		pointer-events: none;
	}
	.is-3d .stop-intro .panel::before { height: 70%; }
	.is-3d .stop-about .panel::before { height: 100%; background: rgba(8, 8, 10, 0.82); }
	.vignette { background: linear-gradient(0deg, rgba(8, 8, 10, 0.4) 0%, rgba(8, 8, 10, 0) 30%); }
	h1 { font-size: 3.2rem; }
	h2 { font-size: 1.9rem; }
	.lede { font-size: 1rem; }
	.stop-about .panel p:not(.kicker):not(.lede-sm) { font-size: 0.92rem; }
	.stop-about .roles li { font-size: 0.85rem; padding: 0.4rem 0; }
	.stop-about .tools { display: none; }
	.hud-chapter { min-width: 0; }
	.hud { bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px)); gap: 0.8rem; }
	.hud-play { width: 2.2rem; height: 2.2rem; }
	.is-3d .panel { padding-bottom: 4.4rem; }
	.nav { font-size: 0.85rem; }
	.nav nav { gap: 0.9rem; }
}

/* Lite: a plain scrolling page with each clip inline */
.is-lite .world, .is-lite .hud, .is-lite .only-3d { display: none !important; }
.is-lite .stops { padding: 5rem var(--gutter) 3rem; max-width: 70rem; margin: 0 auto; }
.is-lite .stop { padding: 3.5rem 0; border-bottom: 1px solid var(--line); display: grid; gap: 1.5rem; }
.is-lite .stop-intro { padding-top: 6rem; }
@media (min-width: 820px) {
	.is-lite .stop:not(.stop-intro):not(.stop-about):not(.stop-contact) { grid-template-columns: 1.5fr 1fr; align-items: center; }
}
.lite-media { background: #000; }
.lite-media video { width: 100%; height: auto; max-height: 80vh; object-fit: contain; cursor: pointer; }

/* Player */
.player {
	padding: 0;
	border: 0;
	background: transparent;
	max-width: 100vw;
	max-height: 100vh;
}
.player::backdrop { background: rgba(0, 0, 0, 0.9); }
.player video { max-width: 92vw; max-height: 86vh; background: #000; }
.player-close {
	position: fixed;
	top: 1rem;
	right: 1rem;
	font: inherit;
	font-size: 0.9rem;
	color: var(--fg);
	background: rgba(0, 0, 0, 0.6);
	border: 1px solid var(--line);
	border-radius: 999px;
	padding: 0.5rem 1rem;
	cursor: pointer;
}
.is-lite .nav { background: rgba(8, 8, 10, 0.88); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }

/* Milestone gates on the timeline */
.is-3d .stop-gate { height: 150vh; }
.gate-year {
	font-size: clamp(4rem, 11vw, 9rem);
	font-weight: 800;
	font-stretch: 125%;
	line-height: 0.8;
	letter-spacing: -0.04em;
	margin-bottom: 0.9rem;
	font-variant-numeric: tabular-nums;
}
.gate-notes { list-style: none; padding: 0; margin: 0.4rem 0 0; display: grid; gap: 0.45rem; }
.gate-notes li { padding-left: 1.1rem; position: relative; color: #d6d4ce; font-size: 0.98rem; }
.gate-notes li::before { content: ''; position: absolute; left: 0; top: 0.68em; width: 0.5rem; height: 1px; background: var(--muted); }
.is-lite .stop-gate { grid-template-columns: 1fr !important; }

/* Timeline ticks under the progress line */
.track-ticks { position: absolute; inset: 0; }
.track-tick { position: absolute; top: 50%; width: 1px; height: 8px; margin-top: -4px; background: var(--muted); pointer-events: none; }
.track-tick span {
	position: absolute;
	top: -1.35rem;
	left: 50%;
	transform: translateX(-50%);
	font-size: 0.7rem;
	letter-spacing: 0.04em;
	font-variant-numeric: tabular-nums;
	color: var(--muted);
	transition: color 0.3s;
}
.track-tick.is-past { background: var(--fg); }
.track-tick.is-past span { color: var(--fg); }
@media (max-width: 999px) { .gate-year { font-size: 4.2rem; } .track-tick span { font-size: 0.62rem; } }